Which two external resources can provide sewer line data for analysis?

ArcGIS Online is a cloud-based mapping and analysis tool that allows users to share and access a wide variety of geographic data, including sewer line information. It hosts numerous datasets contributed by various organizations and agencies, making it a common resource for obtaining relevant and updated spatial information. The platform serves as an ideal source for users seeking to access external datasets for conducting GIS analyses.

GeoData.gov is another crucial resource for obtaining sewer line data. This portal serves as a repository for geospatial data provided by various levels of government. It includes datasets from federal, state, and local agencies, which often encompass infrastructure data, including sewer lines. By leveraging GeoData.gov, users can find authoritative datasets for their analyses.

In contrast, ArcCatalog and the Catalog window are tools within the ArcGIS software suite designed to manage and organize local geospatial data rather than serve as sources for external datasets. They do not provide access to external data repositories and are mainly used for data management tasks within a GIS environment. Thus, while they are essential for data organization, they do not fulfill the requirement for sourcing sewer line data specifically.